@article{oai:nagoya.repo.nii.ac.jp:00028668, author = {Kajita, Shin and Hatae, Takaki and Kusama, Yoshinori}, issue = {10}, journal = {Review of Scientific Instruments}, month = {Oct}, note = {In this study, we investigate designs for polychromators of the ITER edge Thomson scattering system by means of numerical calculations. For this purpose, we discuss the optimum transmission wavelength ranges of the optical filters and the optimum number of filters. Five different filter arrangements, including those with an optical notch filter to eliminate Dα emission, are compared with each other. The measurement accuracy when using a polychromator is evaluated for midplane port configuration. It is found that the optimum filter number keeping in mind the cost performance cost is 5 or 6. Moreover, the use of an optical notch filter increases the measurement accuracy by approximately 5%.}, title = {Design study of polychromators for ITER edge Thomson scattering diagnostics}, volume = {79}, year = {2008} }